Very first and tops on the list is to check the ground wire from the engine block to the battery negative terminal. Then check the 'bonding strap' on the fire wall to the engine block in the back of engine compartment. There should be a strap or wire going to the engine block to ground the instrument and dash panel.
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Do you happen to know the location of where they had attemped to forcfully rip/yank on the wiring?
The only problem is that when at 65+ mph the engine would stall, can you tell me if then it would strat right back up or would it not start at all?
When it would stall would it just die like you turned the key off or would it cough and stuble with no acelleration?
When you state it will not start now how long has the time frame been from when the problem first started?
When it does not start if you turn the key on do the dash lights come on?
If they do and you try to start do you hear a clicking or a clunk or nothing at all?
Is this a manual or auto transmission?
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It is automatic. I have not tried again for a while.
I will probably need to charge the battery again.
Ok no problem, just wanted to make sure you received my reply so we can try to get this fixed for you.
Once you do as you state may need done please copy and paste what I wrote you above and after each of my questions provide the best answer that you can, this will help speed up answers I can provide to you.
Something else as a quick test since it is an auto trans ir have someone hold their foot on the brake and try to start the truck, at the same time have another person tapping on the starter with a blunt object, make sure not to touch/hit the cable connections on it as they will spark and cause welding. Make sure you keep the truck in park and the e-brake on.
Let me know if it then trys to start.